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HEC-RAS ia a free Hydraulic Modeling and Analysis Software Developed and Distributed by US Army Corps of Engineers.This is a really useful tool for Hydraulic Analysis and Flood Plain Mapping. Link: http://www.hec.usace.army.mil/
This video tutorial from IDModeling demonstrates how to create user defined fields and customize tables in Bentley System's WaterGEMS software.
CFD used to see fluid inside the pump and how it interacts with casing. This was one design - many were run in CFDesign FAST to compare and make the design better in a few days...not weeks...